[@floodtalon] As previously displayed, militarily achieving dominance over the field of battle does not equal winning.

At the end of the first battle, the Machina were the only ones left standing on the Elicitor. The Demons won.

The fight outside the Volcano is in the end, a big song and dance that serves to distract characters until someone who chose to fight the meaningful battle on the inside wins.

I'm willing to bet that if someone finally does win the battle outside and there's no one left standing but one side, things will pause long enough for the internal battle to resolve and pick a winner, rather than Juno coming inside and trashing everybody and autowinning for Team Angel.